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What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting oxygen sensor errors on Puritan Bennett 560 ventilators. Oxygen sensor errors can prevent the ventilator from delivering the prescribed FiO₂ accurately, trigger alarms, or restrict clinical use. Most causes are external or easily verifiable, such as loose connections, contamination, or depleted sensors, before assuming internal sensor failure.
Step-by-Step Troubleshooting
Verify power and device readiness
- Ensure the ventilator is powered on and has passed its basic self-test.
- Confirm that any pre-use check screens are clear before proceeding.
- Why it matters: Sensor errors can sometimes be falsely reported if the device is in a transitional state or not fully initialized.
Inspect the oxygen sensor physically
- Locate the oxygen sensor (typically near the inspiratory limb or inside the sensor module).
- Check for obvious damage, contamination, or moisture on the sensor tip.
- Ensure it is securely seated in its connector.
- Why it matters: Loose or contaminated sensors are the most common cause of errors.
Check connections and wiring
- Verify that the sensor cable is not frayed, bent, or pinched.
- Disconnect and reconnect the sensor to confirm a solid connection.
- Why it matters: Poor connections can cause intermittent readings or trigger error codes.
Review sensor calibration status
- Check the ventilator menu for sensor calibration status.
- If the sensor requires calibration or replacement, note the date of last calibration.
- Why it matters: Some sensors have a limited life and must be recalibrated to function properly.
Swap with a known good sensor (if available)
- Replace the current sensor with a functioning spare.
- Observe if the error persists.
- Why it matters: Confirms whether the issue is with the sensor itself or the ventilator electronics.
Verify FiO₂ delivery and readings
- Run a test on the ventilator with the patient circuit disconnected (ensure patient safety).
- Observe the oxygen concentration readings for stability and accuracy.
- Why it matters: Helps ensure the ventilator reports accurate oxygen levels before patient use.
If the Problem Persists
If external checks do not resolve the error, the sensor or sensor electronics may have failed internally.
- Remove the ventilator from service.
- Label it Out of Service.
- Send the device for bench evaluation or repair.
Knowing when to stop and escalate is proper troubleshooting.
Clinical Use Tip
Do not troubleshoot on an active patient. Move the patient to another ventilator if oxygen delivery is compromised. Only perform bench testing when the circuit is not connected to a patient.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Ventilator shows oxygen sensor error during pre-use check.”
Cause
What was observed during troubleshooting.
Example:
Sensor cable was loose, or sensor tip contaminated (observed during inspection).
Resolution
What action was taken.
Example:
Reconnected the sensor securely and cleaned the sensor tip. Tested ventilator; error resolved. If unresolved, note sensor replacement or device sent to service.
Helpful Details to Include
- Sensor serial number and installation date
- Last calibration date
- Alarm code specifics
- Any moisture or contaminants noted
- Circuit configuration during testing
Final Thought
Proper troubleshooting of oxygen sensor errors ensures patient safety and reliable oxygen delivery. Begin with external checks and simple solutions, and escalate to service when necessary. Document all steps clearly using the CCR method to provide a clear record of actions taken.
That is successful troubleshooting.